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Amazon [amazon.com] has 1-Gal Ortho GroundClear Super Weed & Grass Killer Refill for $ 8.97. Shipping is free w/ Amazon Prime or on $ 25+ or $ 35+ orders (depending upon location). Overall rating of 4.4 out of 5 based on over 3,400 customer reviews.

Home Depot [homedepot.com] has 1-Gal Ortho GroundClear Super Weed & Grass Killer Refill for $ 8.97 with free store pickup.